GRAT 75 Review: Who It Fits and Who Should Skip It
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This grat 75 review covers the GRAT 75,000 BTU Full Inverter Pool Heat Pump. It is an air-source heat pump designed for pools up to 21,000 gallons. The unit features a 75,000 BTU heating capacity and a titanium heat exchanger. It supports both heating and cooling modes. You can control it via a mobile app using 2.4GHz WiFi. Bluetooth is needed for initial pairing. The device operates quietly at 50 dB. Its UV-resistant ABS housing protects against weather. This model, GTHP2109CSA32, offers smart monitoring. It captures ambient heat rather than generating it directly, which improves efficiency.
What stands out
- 75,000 BTU heating capacity for pools up to 21,000 gallons
- Full inverter compressor technology for energy efficiency
- Titanium heat exchanger resistant to corrosion in saltwater pools
- WiFi and Bluetooth app control with 2.4GHz connectivity
- Quiet operation at approximately 50 dB
Who it fits
Good fit for
This heat pump suits owners of above-ground or inground pools between 10,000 and 21,000 gallons who want precise temperature control. If you have a saltwater pool, the titanium heat exchanger offers better durability against corrosion. You will appreciate the smart app features if you prefer adjusting settings remotely via WiFi. The cooling mode is useful in warmer months. The quiet 50 dB output makes it suitable for backyard installations where noise matters.
Who should skip it
Skip this unit if your pool exceeds 21,000 gallons, as the 75,000 BTU capacity may be insufficient for larger volumes. You should look elsewhere if you lack a stable 2.4GHz WiFi signal, since the app relies on this connection for remote control. Bluetooth is only for setup, so constant phone proximity is not required after pairing. If you need a gas heater for extremely cold climates, note that this air-source unit may struggle below freezing despite its automatic defrost feature.
Verdict: The GRAT 75,000 BTU heat pump is a solid choice for medium-sized pools needing efficient, smart-controlled heating and cooling. Its titanium exchanger and inverter technology make it durable and cost-effective for regular use.
Key specs for this heat pump
Heating Capacity: 75,000 BTU
This rating indicates the thermal energy the unit moves per hour. Higher BTU values allow faster water temperature increases. You should match this output to your pool volume to avoid underperformance. Smaller pools heat quickly, while larger ones may take longer. This spec helps you determine if the unit is powerful enough for your specific setup without wasting energy on oversized hardware.
Pool Capacity: Up to 21,000 gallons
This limit defines the maximum water volume the system is designed to handle efficiently. Pools exceeding this size may experience slow heating cycles or struggle to maintain temperature. You should verify your pool's gallon count before purchasing. Staying within this range ensures the compressor runs optimally. It prevents the unit from overworking, which extends the lifespan of the internal components and maintains consistent water warmth.
Compressor Technology: Full Inverter
Inverter technology adjusts the compressor speed to match the heating demand. Unlike traditional units that cycle on and off, this method maintains a steady temperature with less energy. You will likely see lower electricity bills and quieter operation. This spec is crucial for buyers seeking efficiency. It reduces wear and tear on the motor. The system adapts to ambient air temperatures, providing stable heat without the power spikes of fixed-speed compressors.
Connectivity: Wi-Fi, Bluetooth
These features allow remote monitoring and control via a mobile app. Bluetooth assists with initial pairing, while Wi-Fi enables long-distance management. You can adjust settings from anywhere with an internet connection. This convenience is ideal for users who want to check temperatures before entering the water. It eliminates the need to walk outside to adjust controls. This spec adds modern usability to the heating system, fitting seamlessly into smart home routines.
Operational Modes: Heating and cooling
The unit can both raise and lower water temperatures. This dual function allows you to cool the pool during hot summer months. You get year-round utility from a single device. This versatility is valuable for regions with extreme seasonal variations. It prevents the water from becoming too warm for comfort. By offering both modes, the system provides comprehensive climate control for your pool environment, adapting to changing weather conditions effectively.
Design and Build Overview
The GRAT 75 measures 34 inches in length, 22 inches in height, and 18 inches in width. This compact footprint allows you to place it in tight poolside areas without crowding the deck. The housing is made from UV-resistant ABS plastic in gray. According to the listing, this material choice helps protect the unit from fading, cracking, and harsh weather over time. The titanium heat exchanger is another key material detail. It offers strong corrosion resistance, which means you can use the pump with both freshwater and saltwater pools without worrying about damage to the internal components.
Control layout centers on an onboard digital panel for local adjustments. You can also manage settings remotely via the included mobile app. The listing specifies that Bluetooth is required for the initial pairing process. After setup, a 2.4GHz WiFi connection enables ongoing remote monitoring and control. This dual connectivity option gives you flexibility depending on your network setup. The unit operates quietly at approximately 50 dB, so it will not dominate the ambient noise of your outdoor space.
The design supports both heating and cooling modes. You can set the heating range from 46°F to 104°F and the cooling range from 45°F to 82°F. An automatic defrost feature is built into the system. This helps maintain efficiency when outdoor temperatures drop. The overall construction prioritizes durability and smart integration, making it suitable for year-round outdoor use in various climates.
Setup And Daily Operation
You connect this unit via a 2.4GHz WiFi network for remote management. Bluetooth is required for the initial pairing process with your mobile device. The GRAT 75 supports app control and includes an onboard digital panel. You can adjust settings directly on the unit or through the smartphone interface. This dual control method allows you to monitor status from a distance or make quick changes nearby.
The heating range spans 46°F to 104°F. The cooling mode operates between 45°F and 82°F. You can switch between heating and cooling modes as needed. The system uses automatic defrost technology to maintain efficiency in cooler weather. This feature helps prevent ice buildup without requiring manual intervention.
Operation is rated at approximately 50 dB. This noise level allows for quiet poolside use without disrupting your environment. The full inverter compressor adjusts its speed to match demand. This technology helps reduce energy consumption compared to traditional on-off heating cycles. The titanium heat exchanger handles both freshwater and saltwater pools. It resists corrosion, ensuring long-term durability in various water conditions.
For daily use, the manufacturer recommends using a pool cover. This simple step reduces heat loss and improves overall energy efficiency. Covering the pool, especially during cooler evenings, helps the heat pump maintain your desired temperature with less effort. The UV-resistant ABS housing protects the unit from fading and cracking during outdoor installation.
Before You Buy This Heat Pump
You need a pool cover to maximize efficiency. The manufacturer notes that covers reduce heat loss during cooler evenings. Without one, the inverter compressor works harder, increasing energy use. You must verify your pool size. This unit handles up to 21,000 gallons. Larger volumes may not reach target temperatures efficiently. Check your local climate. The automatic defrost feature helps in cold weather, but extreme lows can impact performance. You should also confirm your electrical setup supports the full inverter compressor load. This heat pump suits those seeking quiet, smart control for medium-sized pools. It fits alongside gas heaters if you prioritize lower operating costs over instant heat. It differs from smaller units by offering dual heating and cooling modes. Ensure you have space for the 34-inch length and proper airflow around the UV-resistant ABS housing. Regular maintenance of the titanium heat exchanger keeps saltwater corrosion at bay.
Check before you buy
- Verify pool volume is under 21,000 gallons
- Confirm 2.4GHz WiFi availability for app control
- Check local climate for defrost needs
- Ensure adequate airflow around the unit
- Purchase a pool cover to save energy
The product at a glance
GRAT 75,000 BTU Full Inverter Pool Heat Pump
Best for: medium pools needing smart remote control
- Heating Capacity
- 75,000 BTU
- Pool Capacity
- 21,000 Gallons
- Compressor Technology
- Full Inverter
- Operational Modes
- Heating & Cooling
- Connectivity
- WiFi, Bluetooth
- Control Type
- App Control
View on Amazon: GRAT 75,000 BTU Full Inverter Pool Heat Pump Affiliate link
The GRAT 75,000 BTU heat pump uses full inverter technology to heat pools up to 21,000 gallons. It offers both heating and cooling modes with a titanium heat exchanger for corrosion resistance. You can control it via WiFi and Bluetooth using a mobile app. The unit runs quietly at 50 dB and features automatic defrost. Its compact dimensions fit standard poolside spaces.
Pros
- 75,000 BTU heating capacity for pools up to 21,000 gallons
- Full inverter compressor for energy-efficient temperature control
- WiFi and Bluetooth app control for remote monitoring
- Titanium heat exchanger resists saltwater and freshwater corrosion
- Quiet operation at approximately 50 dB
Cons
- Limited to 2.4GHz WiFi networks for app connectivity
- Bluetooth required for initial device pairing setup
- Heating range stops at 104°F maximum
Good fit if
- You own a pool between 10,000 and 21,000 gallons
- You want to adjust temperatures remotely via smartphone
- You need a unit that also cools water in summer
Skip if
- You require 5GHz WiFi connectivity for the app
- Your pool exceeds 21,000 gallons in volume
- You prefer a gas heater for faster heating speeds
Verdict: GRAT 75k BTU Inverter Pool Heat Pump suits pool owners with medium-sized pools who value smart control and energy efficiency. It delivers stable heating and cooling for pools up to 21,000 gallons.
Specifications side by side
| Spec | GRAT 75,000 BTU Full Inverter Pool Heat Pump |
|---|---|
| Heating Capacity | 75,000 BTU |
| Pool Capacity | 21,000 Gallons |
| Compressor Technology | Full Inverter |
| Operational Modes | Heating & Cooling |
| Connectivity | WiFi, Bluetooth |
| Control Type | App Control |
| Use | Poolside, Inground Pools |
| Capacity | 21,000 Gallons |
| Dimensions | 34 × 18 × 22 inches |
| Color | Gray |
| Model | GTHP2109CSA32 |
Frequently asked questions
Is the GRAT 75 suitable for small hot tubs?
No, this unit is designed for pools up to 21,000 gallons. It delivers 75,000 BTU of heating capacity, which is excessive for small spas. You should use a lower-output heater for hot tubs to avoid rapid temperature swings and energy waste. This model is strictly for medium to large pools.
Does the GRAT 75 cool water as well as it heats?
Yes, the GRAT 75 supports both heating and cooling functions. It uses a full inverter compressor to manage temperature direction. This allows you to lower the water temperature during hot weather. The system maintains stable temperatures for both heating and cooling modes effectively.
What is the physical size of the GRAT 75 heat pump?
The unit measures 34 inches in length, 22 inches in height, and 18 inches in width. Its compact footprint fits into tight poolside areas. The gray housing is made from UV-resistant ABS plastic. You can place it near the pool without crowding the deck space.
How do you control the GRAT 75 remotely?
You control it via an app connected through a 2.4GHz WiFi network. Bluetooth is required for the initial pairing with your mobile device. You can also adjust settings directly on the onboard digital panel. This gives you flexibility to manage the unit from anywhere or up close.
Is the heat exchanger durable for pool water?
Yes, the GRAT 75 features a titanium heat exchanger. Titanium resists corrosion from pool chemicals and saltwater. This material choice helps ensure long-term durability and efficient heat transfer. It protects the internal components from degradation over time, maintaining performance throughout the heating season.
Can I install the GRAT 75 indoors?
No, the GRAT 75 is rated for poolside use only. It is an air-source heat pump that requires adequate airflow. Installing it indoors could restrict ventilation and reduce efficiency. You must place it in an outdoor area with good air circulation for proper operation.